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Proton motions in hydrated proton conducting perovskites BaZr 0.90 A 0.10 O 2.95 (A=Y and Sc) have been investigated using quasielastic neutron scattering. The results reveal a localized motion on the ps time scale and with an activation energy of ~10–30 meV, in both materials. The temperature dependence of the total mean square displacement of the protons shows an onset of...
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